"As early as the age of three, children already appear to be engaging in a variant of the golden rule: 'do unto others as they have done unto you."

In the study, children were presented with a puzzle that consisted of a picture covered in such a way as to allow only a small section to be seen.

The children could not see what was in the picture but could interact with two puppets. Puppets are used in studies like this one because children treat them as peers.

One puppet announced that it knew what the picture was and proceeded to tell the child. The second puppet said that it also knew the picture, but was not going to tell.

Both puppets spoke in happy, friendly tones, and looked alike; they only differed in their willingness to provide information.

Children were able to determine which puppet was helpful and, when the one puppet needed help reaching a far-way toy or solving a puzzle of their own, the children were quick to identify which puppet had helped them and returned the favour.

"There is a growing body of research demonstrating that toddlers spontaneously help others in many situations," says Dr. Kuhlmeier, director of the Infant Cognition Group at Queen's.

"What we are also finding is that they pick out the helpers around them, even when the helpful act is as simple as teaching them something new about their world, and they return the favour with their own helpful acts."